<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog"
            >添加分类</el-button
          >
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
        :show-row-hover="false"
        class="treeTable"
      >
        <template slot="isok" slot-scope="scope">
          <!-- scope.row表示该行的数据的cat_deleted属性的值 -->
          <!-- 是否有效 -->
          <i
            style="color: lightgreen"
            v-if="scope.row.cat_deleted === false"
            class="el-icon-success"
          ></i>
          <i style="color: red" v-else class="el-icon-error"></i>
        </template>
        <!-- 排序 -->
        <template slot-scope="scope" slot="order">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag
            size="mini"
            v-else-if="scope.row.cat_level === 1"
            type="success"
            >二级</el-tag
          >
          <el-tag size="mini" v-else type="warning">三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot-scope="scope" slot="opt">
          <el-button type="primary" icon="el-icon-edit" size="mini" @click="editC(scope.row)"
            >编辑</el-button
          >
          <el-button type="danger" icon="el-icon-delete" size="mini" @click="deleteCategory(scope.row)"
            >删除</el-button
          >
        </template>
      </tree-table>

      <!-- 分页区 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>

    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加用户"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @closed="addCateDialogClosed"
    >
      <!-- 内容主体区 -->
      <!-- prop绑定的是校验规则对应对象的属性 -->

      <!-- 添加分类的表单 -->
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
        class="demo-ruleForm"
      >
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <!-- options绑定的是数据源 -->
        <!-- props用来指定配置对象 -->
        <!-- v-model必须绑定一个数组 -->
        <el-form-item label="父级分类:">
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChanged"
            clearable
          ></el-cascader>
        </el-form-item>
      </el-form>
      <!-- 底部区 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>

        <el-dialog
      title="修改分类"
      :visible.sync="editDialogVisible"
      width="50%"
      @closed="editClosed"
    >
      <el-form
        :model="editForm"
        :rules="editRules"
        ref="editRuleFormRef"
        label-width="100px"
        class="demo-ruleForm"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="editForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCategory">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      //商品分类的数据列表,默认为空
      catelist: [],
      //总数据条数
      total: 0,
      //为table指定列的定义,一个对象一列
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name',
        },
        {
          label: '是否有效',
          //表示将当前列定义为模板列
          type: 'template',
          //表示当前这一列使用的模板名称
          template: 'isok',
        },
        {
          label: '排序',
          //表示将当前列定义为模板列
          type: 'template',
          //绑定到当前这一列使用的模板名称对应的模板
          template: 'order',
        },
        {
          label: '操作',
          //表示将当前列定义为模板列
          type: 'template',
          //绑定到当前这一列使用的模板名称对应的模板
          template: 'opt',
        },
      ],
      //添加分裂对话框的显示与隐藏
      addCateDialogVisible: false,
      addCateForm: {
        //将要添加的分类的名称
        cat_name: '',
        //父级分类的id,默认添加一级分类时,默认父级id为0
        cat_pid: 0,
        //分类的等级,默认为一级分类
        cat_level: 0,
      },
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' },
        ],
      },
      //父级分类的列表
      parentCateList: [],
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        checkStrictly: 'true',
        expandTrigger: 'hover',
      },
      //选中的父级分类的Id数组
      selectedKeys: [],
      editDialogVisible: false,
      editForm: {},
      editRules: {
        cat_name: [
          { required: true, message: '分类名称不能为空', trigger: 'blur' },
        ],
      },
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取商品分类数据,params是get请求传递的参数(对象)
    async getCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: this.queryInfo,
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败!')
      }
      //把查询的数据保存到catelist
      this.catelist = res.data.result
      //为总数据条数赋值
      this.total = res.data.total
    },
    //监听pagesize改变
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    //监听pagenum改变,(页码)
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    //点击按钮,展示添加分类的对话框
    showAddCateDialog() {
      //先获取父级数据分类的数据列表,再打开
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    //获取父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 },
      })

      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类数据失败!')
      }
      this.parentCateList = res.data
    },
    //选择项发生变化触发这个函数
    parentCateChanged() {
      console.log(this.selectedKeys)
      //如果selectedKeys数组中的length大于0,证明选中了父级分类
      //反之,没有选中
      if (this.selectedKeys.length > 0) {
        //父级分类的id
        this.addCateForm.cat_pid =
          this.selectedKeys[this.selectedKeys.length - 1]
        //为当前分类的等级赋值
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      } else {
        //父级分类的id
        this.addCateForm.cat_pid = 0
        //为当前分类的等级赋值
        this.addCateForm.cat_level = 0
      }
    },
    //点击按钮,添加新的分类
    addCate() {
      this.$refs.addCateFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          'categories',
          this.addCateForm
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败!')
        }
        this.$message.success('添加分类成功!')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    //监听对话框的关闭,重置表单
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    },
    editC(row) {
      this.editForm = row
      this.editDialogVisible = true
    },
    editClosed() {
      this.editForm = {}
      this.$refs.editRuleFormRef.resetFields()
    },
    editCategory() {
      this.$refs.editRuleFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          'categories/' + this.editForm.cat_id,
          this.editForm
        )
        if (res.meta.status !== 200) {
          return this.$message.error('更新分类参数失败')
        }
        this.editDialogVisible = false
        this.$message.success('更新分类成功')
        this.getCateList()
      })
    },
    deleteCategory(row) {
      if (row.cat_level < 2 && row.children.length !== 0) {
        this.$confirm('此操作将删除该分类及其所有的子分类, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning',
        })
          .then(() => {
            this.deleteById(row.cat_id)
          })
          .catch(() => {
            this.$message({
              type: 'info',
              message: '已取消删除',
            })
          })
        return
      }
      this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning',
      })
        .then(() => {
          this.deleteById(row.cat_id)
        })
        .catch(() => {
          this.$message({
            type: 'info',
            message: '已取消删除',
          })
        })
    },
    async deleteById(id) {
      const { data: res } = await this.$http.delete('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('删除失败')
      }
      this.$message.success('删除成功')
      this.getCateList()
    },
  },
}
</script>

<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>
